Fire bar for furnaces



June 10, 1930. w. J. ERDC'5S FIRE BAR FOR FURNACES Filed July 12, 1924 Patented June 10, 1930 UNITED STATES WILLIAM JOSEPH ERD'fiS, OF BUDAPEST, HUNGARY FIRE BAR FOR FURNACES Application filed July 12, 1924, Serial No. 725,710, and in Hungary July 24, 1923.

My invention relates to fire bars adapted to be used in any kind of furnace and my invention relates more particularly to fire bars which form a grate by placing them side by side, edgeways.

Narrow edged fire bars of the type just mentioned are known whose upper surfaces are provided with sidewise projecting tongues which, when the bars are assembled side by side, enter the spaces between the tongues on neighbouring bars.

Such fire bars have the defect of allowing unburnt small coal to fall between them, while the grate area is comparatively small,

but, on the other hand, they possess the advantage of offering a large cooling surface, and are strong even if built lightly.

On the other hand, fire bars adapted to be arranged closely side by side to form a grate and provided on the vertical narrow sides of their cross section with nozzle-like cavities are also known. While with this construction the fall of unburnt small coal is prevented and a larger grate area is obtained, yet

they possess the defect of ofiering little resistance to bending unless they are built unduly heavy; and they moreover show the further drawback that they offer a materially smaller cooling surface than narrow edged fire bars,

but aside from this, when they are applied to existing furnaces in most cases alterations are required in the usual grate mountings.

This invention has for its object a construction which possesses the advantages of both types of fire bars without their defects.

According to this invention the upper surface attached to the stem of a stationary fire bar consists of a series of wings arranged at a slight inclination to the horizontal or to the longitudinal direction of the bars. With a good supply of air, it will be found that the grate area is sufficient, while fuel cannot fall between the bars and that, moreover, owing to the narrow edge arrangement, the

fire bars can be made sufficiently strong, while being lighter than broad edge bars. Besides, such fire bars can be mounted in existing furnaces on the usual grate supports in place of a number of grate bars which are removed,

while no alteration or change whatever is necessary in the existing grate mountings.

The invention is illustrated in the accompanying drawings in which Figures 1 to 3 are respectively a cross section, a side elevation and a plan, while Figure 4 shows a longitudinal section through a boiler. Figure 5 is a cross-section through the boiler of F igure l, and Figure 6 is a section showing the grate bars in plan.

Referring more particularly to Figures 1 to 3, a is the stem of the fire bar to which is attached a top surface, which consists of a series of wings in the form of an angle, the upper shank of which is at a slight inclination relative to the longitudinal direction of the fire bars or to the horizontal, whereas their downwa 'dly extending shanks or projections 5 have preferably pointed ends 6 to provide air inlets of large cross section. The upper shanks b of the wings are nearly tangential to the grate surface and overlap, thus preventing the passage of fuel through them. 0 are nozzle like channels situated between adjoining curved or bent wings for the inlet of air to the fuel.

Owing to the comparatively great height of the fire bars, they provide a large cooling surface and are of considerable strength. To increase the cooling surface the shanks 6 of the wings may be tapered off transversely, as shown at In, Figure 1.

(Z are additional or auxiliary tapering air inlets provided on the wings which facilitate ignition and allow of burning slack or fuel furnishing considerable amounts of slag; the said holes (Z are preferably formed half on each side of adjacent wings, as shown in Figure 3.

The two end wings are provided with a supporting portion f, forming a bearing surface similar to that usual with normal fire bars for plane grates, so that the bars can be placed upon mountings usually employed in existing furnaces without any alteration thereof.

The upper surface of the fire bars may be formed by a double row of wings arranged preferably symmetrically on both sides of the stem a, the wings of both rows running in the same direction or in opposite directions.

In Figure 4 the fire bars a are shown running in the same direction, the fire bars, however are placed into the furnace side by side preferably alternatively at an angle of to each other, so that the air conducting nozzles of different or adjacent bars alternate, forming thereby a grate in which the direction of the incoming air alternates as is shown by arrows in Figure 6.

Though I have shown in the drawings but three methods of inserting my improved fire bars, it is obvious that they may be built in in any manner known or desired, in'a horizontal 0r inclined plane, without departing from the spirit of my invention.

I claim as my invention In a fire bar the combination with a series of wings each having an upper shank at one end thereof and in angular relation thereto a lower shank the lower portion of which is tapered and the upper portion of which is partly overlapped by the upper shank of the adjacent wing. the top surface of each upper shank being slightly inclined and the lower shanks as a whole being substantially perpendicularly arranged relative to the longitudinal direction of the fire bar; of a stem the height of which exceeds the length of the said lower shanks, the upper shanks of the wings forming a top substantially parallel with the said longitudinal direction of the fire bar and extending laterally beyond the sides of said stem. t

In testimony whereof I affix my signature.

IVILLIAM JOSEPH ERDOS. 

